Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5176a9e020c0a1c…

MALICIOUS

PDF

53.9 KB Created: 2020-07-23 06:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3accf94da389c063c838f2687af0ba0 SHA-1: 1819bfbbcab05ffd1758096b90e42f2df717d9d9 SHA-256: a5176a9e020c0a1cf253df40e72cddf77f1305cebd998bb089a5dedf38bac128
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'ttraff.com'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of external PDF links, many hosted on Shopify. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be largely obfuscated or contains minimal readable text, but the presence of the redirector link and link farm strongly suggests a malicious intent, likely to lure users to malicious sites.

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.com/pify?keyword=makalah+retinoblastoma+pdf
    • http://files.413arearaconference.com/uploads/1/3/2/3/132302732/ba4b59767f9b832.pdf
    • http://files.tlsleadership.com/uploads/1/3/0/9/130969535/filor.pdf
    • http://files.trimmedandtraveled.com/uploads/1/3/1/8/131871704/guwobixux-momijovejufozed-vawol-moxarosebabine.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/natelufenamatiwetatudo.pdf
    • https://cdn.shopify.com/s/files/1/0430/7949/9940/files/gukivajedexituna.pdf
    • https://cdn.shopify.com/s/files/1/0435/9893/8274/files/6485997954.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/nizipozidup.pdf
    • https://xedebixudo.files.wordpress.com/2020/07/mugifigajawupukijobuzoki.pdf
    • https://jodupirif535214197.files.wordpress.com/2020/06/90360893297.pdf
    • https://fazabile.files.wordpress.com/2020/07/66994464413.pdf
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/59713117164.pdf
    • https://cdn.shopify.com/s/files/1/0430/9807/9399/files/migopanowe.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16175378270.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/zoguzoverozetafoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/kagitoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0663/files/zepizelenevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/bewirifesibalekojitap.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/
    • https://xedebixudo.files.wordpress.com/2

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095f5.bin
c5c878bbcfd5e96cd71637b75aeefc790c88514ce675eb64cbfe564c5a465315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F5 5276 bytes
font_01_sfnt_off0000a7aa.bin
e3cf6ca59973050f7adea82262b8ab8169a9c4fb6debded5c5cfcfcd8c84108e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7AA 10272 bytes

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