Malicious PDF — malware analysis report

Static analysis result for SHA-256 677e10cf206e6bb1…

MALICIOUS

PDF

41.6 KB Created: 2020-08-05 16:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 299a1764e39e5a5bb00a0c65d3b49da7 SHA-1: 6b9967d8ee91e50c3c99dd3a127d9a56757e49e8 SHA-256: 677e10cf206e6bb15219010ba1ac6324f1592bceffc8e3bad2a425f71ed32109
162 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which are hosted on what appears to be a link farm designed to distribute SEO-optimized PDFs. One prominent URL, 'https://ttraff.ru/pify?keyword=free+download+rapidex+english+speaking+course+book+pdf+in+tamil', is flagged as a malicious redirector. The presence of a 'download button' heuristic further suggests a malicious workflow aimed at tricking users into downloading further content. No scripts were extracted, but the overall structure and linked content indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=free+download+rapidex+english+speaking+course+book+pdf+in+tamil
    • http://files.1stonthreads.com/uploads/1/3/1/4/131455337/ea101a2b99535e4.pdf
    • http://files.wilcotrackandfield.org/uploads/1/3/0/7/130775109/13048.pdf
    • http://files.chloe-bee.com/uploads/1/3/1/0/131070894/1972206.pdf
    • http://files.victoriaprather.com/uploads/1/3/0/9/130969761/mebip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3797/2897/files/53965268195.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/13898108336.pdf
    • https://cdn.shopify.com/s/files/1/0433/9879/1329/files/zaxebupopurigojinitobu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8664/files/74571863061.pdf
    • https://cdn.shopify.com/s/files/1/0438/8824/6936/files/gorunopuvef.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/dungeon_master_s_guide_1983.pdf
    • https://cdn.shopify.com/s/files/1/0430/6314/8706/files/11009004276.pdf
    • https://cdn.shopify.com/s/files/1/0432/1427/4720/files/6679341801.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3863/files/5th_grade_math_standards.pdf
    • https://cdn.shopify.com/s/files/1/0429/2473/6678/files/65486717302.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/how_to_skip_videos_in_everfi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5067/2033/files/sewikizevisodupidi.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/murabelim.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewowa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fc9.bin
6e2b53c26b80d7a684cbfe3cbf8329526fa8707d133134e74389ddedc878e6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC9 5888 bytes
font_01_sfnt_off000073c6.bin
1001144a56a576f701e9453cb3d7f92d285c6238318a3885411d6223a6062dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C6 10892 bytes

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