Malicious PDF — malware analysis report

Static analysis result for SHA-256 018692c317220dab…

MALICIOUS

PDF

132.4 KB Created: 2020-07-29 20:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea91f09333737d7eaa7015bbf05d2d29 SHA-1: c1d26f913520e96d75e41cb44fa7c78f5da0f4e1 SHA-256: 018692c317220dab5bd1ac565d1697a8e6d116c7a00299012a84b7c39f2e2367
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links to external PDF files, many of which are algorithmically generated and hosted on suspicious domains, indicating a link farm for SEO poisoning. One critical heuristic identified a malicious redirector link, suggesting the primary purpose is to funnel users to malicious content. The document body, though heavily obfuscated, contains text related to textbook downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • 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.cc/pify?keyword=10th+class+physical+science+textbook+pdf+download
    • http://files.tatachillalutherancollegelibrary.com/uploads/1/3/2/7/132710704/6598048.pdf
    • http://files.empirefloorsca.com/uploads/1/3/1/4/131438835/morukawulizopo-pozopotozeguxib-buxesusez-fizuvedolivi.pdf
    • http://files.tilitoimistoanjasimola.com/uploads/1/3/1/4/131453577/dumosisixipabexuwupe.pdf
    • http://files.stmonicasparish.com.au/uploads/1/3/0/8/130813768/1062222.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/puxuni.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0437/9413/7249/files/nitoturupesa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/20886173404.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/kadirexi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/jawilino.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/26902690077.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/juxofitelunosebinodegu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4646/9793/files/zegitanedogeweba.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/gotiviwolamopirasa.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/zonuruluwoxe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9472/1187/files/fetavewobi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a34c.bin
2bfdc1f91d630cb96e37ea6ddd6c5c3e7d3c26c90125c927026df97534dbadc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A34C 5500 bytes
font_01_sfnt_off0001b605.bin
1e56cb89ff2c158df074c29ff53c797a3d8bfedfafb8186366d058500d834f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B605 5284 bytes
font_02_sfnt_off0001c7af.bin
a57bc8b9d7ac6be4147fa89285e03f9a06b748f06a72a03be48b544b33a49e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C7AF 10436 bytes
font_03_sfnt_off0001eb8f.bin
c9d058478508aa21faea11bb46fe45d34ba8820029b9b0b2093952805bb38914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EB8F 16248 bytes

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