Malicious PDF — malware analysis report

Static analysis result for SHA-256 0665636fdf0de95d…

MALICIOUS

PDF

47.6 KB Created: 2020-07-30 16:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94c2aa1e80fadcd3a8c99efec13f9eeb SHA-1: 9e67cf56f54859fe996dc3e8815f2c2457c4ba04 SHA-256: 0665636fdf0de95d4650eb90eb123e559efde7e57f40a0d56aa7afaa1a095d25
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, suggests a lure related to 'free pdf books'. The presence of numerous external PDF links, many pointing to Shopify, further supports a link-farming or redirection scheme. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=landscape+architecture+free+pdf+books
    • http://files.ajsartstudio.com/uploads/1/3/2/3/132302960/lopulufow.pdf
    • http://files.gallery2828.com/uploads/1/3/2/3/132303163/8d004eae61206.pdf
    • http://files.felonybbqonline.com/uploads/1/3/1/3/131378835/fubewupatonelekejobi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7266/8319/files/65431685428.pdf
    • https://cdn.shopify.com/s/files/1/0429/0235/6127/files/63376124004.pdf
    • https://cdn.shopify.com/s/files/1/0438/6275/3445/files/sigejusofufetogesaletare.pdf
    • https://cdn.shopify.com/s/files/1/0431/1921/4756/files/10780151826.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/banojuwoze.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jepomosojavadoji.pdf
    • https://cdn.shopify.com/s/files/1/0431/2065/6545/files/31768226704.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/gipafi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4151/2855/files/74718026426.pdf
    • https://cdn.shopify.com/s/files/1/0433/8050/6791/files/kazeli.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/55746173070.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7223/files/pukoxupapo.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_off00007b07.bin
b9448a0dfa45fb71980cc1442f3dd8fa00e1a66fd3425c3ad6cd95ca93c68e14
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B07 5236 bytes
font_01_sfnt_off00008cbf.bin
20295486e117f79c1ddc66e77ef4045f85d909e2858d432addc80291f6036582
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CBF 10568 bytes