Malicious PDF — malware analysis report

Static analysis result for SHA-256 03536f932ea3157d…

MALICIOUS

PDF

53.2 KB Created: 2020-07-13 20:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5b2e0333396c94f62db90a8c6b042b8 SHA-1: 8af1688af87877641f03ed1ca3bdddb93bd7fcfe SHA-256: 03536f932ea3157d834f15700ae235421abc1ec59cc15652cf1fc3a9fe2d1099
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of a link farm suggests an attempt to lure users to external, potentially 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/wb?keyword=nspm%204%20pdf
    • http://files.planbfundingoptions.com/uploads/1/3/2/8/132814518/3781795.pdf
    • http://files.sharing-international.org/uploads/1/3/2/6/132682040/6452909.pdf
    • http://files.thelactx.com/uploads/1/3/2/7/132741194/5300556.pdf
    • http://files.holyspiritschoolfremont.com/uploads/1/3/0/7/130776749/75c5f4a3.pdf
    • http://files.michaelmccarthyart.com/uploads/1/3/1/4/131409717/1251850.pdf
    • http://files.mozzlestead.com/uploads/1/3/1/3/131382141/pobil.pdf
    • http://files.nokillhuntsville.com/uploads/1/3/1/4/131455883/jalupi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://rexumadu.files.wordpress.com/2020/06/xozajukitekozeziduwoxo.pdf
    • https://lebetamawif.files.wordpress.com/2020/06/tamimorefo.pdf
    • https://bekururumema.files.wordpress.com/2020/07/pupek.pdf
    • https://cdn.shopify.com/s/files/1/0431/5054/0964/files/53315452161.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wabodenerevugibew.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/57417236197.pdf
    • https://cdn.shopify.com/s/files/1/0433/5822/4549/files/11836552681.pdf
    • https://cdn.shopify.com/s/files/1/0429/7211/9193/files/tokazezuvoputobitesuroti.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10217245918.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mogapusezonoxifetomo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/pakimofetofejaza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54101174921.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_off000096ec.bin
8c562f55ebc4a5de3da410d57b29ae8b2c20f1574cceffcae5323d56fb488f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96EC 4232 bytes
font_01_sfnt_off0000a53e.bin
7e3cd5f19d4a523881eed427244f6422408a42a0a4edb45a011c4d686969c90b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA53E 10088 bytes

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