Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e2842d71a04e43…

MALICIOUS

PDF

47.1 KB Created: 2020-08-09 06:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 819852987fc8a44dd6445dd236c231ec SHA-1: 38fa274dabc9b11dd3ef9937b5d7c3be0295556d SHA-256: 87e2842d71a04e434d962449e096bbdd7d136e07e8409c9c14a7049fe9872349
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous embedded links, including one pointing to a known malicious redirector, indicating a phishing or scam attempt. The heuristic 'SE_SECRET_RECOVERY_LURE' strongly suggests the document's purpose is to trick users into revealing sensitive recovery information. The presence of many links to external PDFs, some hosted on potentially compromised or malicious domains, further supports a malicious intent, likely related to credential harvesting or advance-fee fraud.

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=solid+principles+c+book+pdf
    • http://jakalon.joelovesyou.de/uploads/1/3/0/8/130874493/viriro.pdf
    • http://riwofesi.toxique.org/uploads/1/3/0/8/130814017/1750014.pdf
    • http://files.imitolab.org/uploads/1/3/0/9/130969960/sepotewuxuwub_pizis.pdf
    • http://ralisajuv.beingwellagingwell.com/uploads/1/3/0/8/130813528/kotototojegapofanaku.pdf
    • http://files.stjohn23rdministryofpresence.org/uploads/1/3/0/7/130739202/tufawidorekul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8036/8796/files/kutanukalexo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6779/3817/files/18679695660.pdf
    • https://cdn.shopify.com/s/files/1/0430/0413/3525/files/black_magic_speed_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/58507258082.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/osha_illumination_standards.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/31362232367.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43396058945.pdf
    • https://cdn.shopify.com/s/files/1/0432/8790/4411/files/20174420699.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/74409567496.pdf
    • https://cdn.shopify.com/s/files/1/0431/6341/8784/files/4261437521.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/99594865370.pdf
    • https://cdn.shopify.com/s/files/1/0435/6489/2323/files/convert_to_word_free_download_windows_10.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_off00007904.bin
aa5bc65c3f344ae1ecd57f65b964562fe8a3948cbb43819b729127ee407178fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 5244 bytes
font_01_sfnt_off00008ae4.bin
27c5484ae32b4f68b153d805e338241dbe818fda7343ec2815630590f00bb4f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE4 10852 bytes

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