Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea669b37f821b2e…

MALICIOUS

PDF

40.3 KB Created: 2020-10-08 23:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 0a2c7461ebc266fab7c8bc2c3e2628c0 SHA-1: 2d24c93f3a116ce0cc988e7e939f1d3880bef7f6 SHA-256: aea669b37f821b2e15d05e608938b65e13c43d55669ac35362f8ac3f87cb2924
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ggtraff.ru/strik?keyword=r%25C3%25A8gles+et+usances+uniformes+600+pdf In PDF document text
    • http://bawube.jadepublishing.org/uploads/1/3/0/8/130814328/2474696.pdfIn PDF document text
    • http://files.morningtonpeninsulacaravanstorage.com/uploads/1/3/1/3/131398385/teboxeda.pdfIn PDF document text
    • http://files.cscaonline.org/uploads/1/3/2/6/132696274/tipovaguwifutug.pdfIn PDF document text
    • http://jovukigip.camillusvocationalblog.com/uploads/1/3/2/6/132696147/9057890.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/1/0481/1338/5635/files/sophocles_antigone_text.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3784/1813/files/rock_band_2_songs_in_order.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9066/0513/files/how_to_hack_like_a_god_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2451/7800/files/85866560891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0485/3924/files/perceiving_reality_consciousness.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5882/6916/files/dizesimabaroxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6739/5236/files/jumutobatorumepilulegeraj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/3385/6664/files/how_to_play_indian_marble_game.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/4181/2380/files/gamanabugejimewo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bd50cb5-821f-4829-ba22-a994bf026829/wojukuwavavem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f6f95fd-528d-47e7-a664-531702d12fa8/15673775465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1744e50c-fb85-4b64-ab75-091b1ba54cd7/10392304429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1bd01c-3900-4624-9492-4851e0e3ad5e/lodokitutezokewivobul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb98ff4-fe3f-4ceb-a219-bdc5c59cd2ef/75687485709.pdfIn 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_off000064e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E1 5920 bytes
SHA-256: 296523a9fcf44003f9cf155d947fb554e931a7723f16ec4c7e3784c2a62e8ded
font_01_sfnt_off000078b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78B9 10692 bytes
SHA-256: 13a20f9ffb6ba0f3141509f7a8fdb762cebaafab423cfa9f6d953c4e9cc679e0

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