Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a9983a59d6cb5e9…

MALICIOUS

PDF

45.3 KB Created: 2020-08-01 04:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 41d78988962036ec8db026f3f7525840 SHA-1: 355340cf9994f58c0ce251528474fc26f935b298 SHA-256: 6a9983a59d6cb5e937288e2d50cac23a7dc21849e4f63035bbe99b2eddd5f0db
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with a critical heuristic identifying a link to a known malicious redirector infrastructure at https://ttraff.com/pify?keyword=counting+flowers+on+the+wall. Another heuristic indicates a link farm of 14 external PDF links, suggesting an attempt to distribute malicious content or engage in SEO abuse. The document body, though heavily obfuscated, contains references to URLs that likely serve as download locations for further malicious activity. The presence of a 'Password-protected archive handoff' heuristic further suggests that this PDF is a lure for a more dangerous payload.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=counting+flowers+on+the+wall In PDF document text
    • http://files.awakeningofthegods.com/uploads/1/3/1/4/131453177/golisalinamuvik_wunov_zudap_dosalibaje.pdfIn PDF document text
    • http://files.deanroadchurchofchrist.org/uploads/1/3/0/7/130739718/vepadoveno-lepasava-nuvumezikox.pdfIn PDF document text
    • http://files.sydneynorthshorepolishsaturdayschool.org/uploads/1/3/0/7/130775772/1931524.pdfIn PDF document text
    • http://files.westfielddentalpa.com/uploads/1/3/0/7/130775942/bavef_kezujuwusuk_javexolizepun.pdfIn PDF document text
    • http://files.sa-machine-learning.org/uploads/1/3/1/0/131070597/1099442.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7000/4126/files/zijuzogaxisovoxor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9334/3899/files/74382206707.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8555/3061/files/fuziwexisuwefukedejaro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2920/8986/files/gutojigol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1141/4939/files/23706986374.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5011/4965/files/17339174048.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5700/5222/files/foxumomolaxaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6768/6558/files/63964612877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5053/9940/files/29159420577.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73A7 5024 bytes
SHA-256: ee2451914f4fe4b909e64e58e5b2cc091125dd2de36296df8eef61ea46355808
font_01_sfnt_off000084ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84CE 10552 bytes
SHA-256: b4e6b50ec758161e482d0b759f578ce1ce8c7147e31ff6061bbd9a3e384f15a8

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