Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c76edde86b6b17…

MALICIOUS

PDF

45.4 KB Created: 2020-08-25 01:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf32d4f873324380c85c233909c8f349 SHA-1: 410f9ece500fefeb2792c59f9b7bacb849f460fd SHA-256: 48c76edde86b6b1792e36cd6073550ed8987fb2331236710b33383e798ef6821
152 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation. One critical heuristic identified a redirector link to 'ttraff.cc', which is known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same redirector URL and a Shopify URL.

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=android+actionbar+menu+icon+size
    • http://files.bntsp.com/uploads/1/3/2/6/132680905/6945942.pdf
    • http://lozisin.nchotsaucecontest.com/uploads/1/3/2/3/132302868/feluwebeweboworimore.pdf
    • http://files.asasoftballmissouri.org/uploads/1/3/1/3/131379738/dasoxeragibufu.pdf
    • http://files.robertsedgley.com/uploads/1/3/1/8/131859370/4552408.pdf
    • http://wefetimu.thelionswhelp.com/uploads/1/3/0/9/130969933/7499891.pdf
    • https://cdn.shopify.com/s/files/1/0451/9323/2535/files/pojakumuxixag.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2822/files/mnemonic_strategies.pdf
    • https://cdn.shopify.com/s/files/1/0460/3910/5700/files/barretos_2018_cd.pdf
    • https://cdn.shopify.com/s/files/1/0433/9076/3175/files/73599837894.pdf
    • https://cdn.shopify.com/s/files/1/0433/3027/3448/files/kopepuvenavanekabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0435/4496/9367/files/behaviorist_theory_of_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/86480672519.pdf
    • https://cdn.shopify.com/s/files/1/0428/9862/0569/files/sefegugifovojadefij.pdf
    • https://cdn.shopify.com/s/files/1/0435/2956/8408/files/22573612936.pdf
    • https://cdn.shopify.com/s/files/1/0432/8371/0117/files/kunafasadosizerowojepemo.pdf
    • https://cdn.shopify.com/s/files/1/0453/8466/3208/files/64379033721.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4893/files/84561859161.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006427.bin
512068a9f27faee261bf8d8bf65731a7e5fbfb716adb4f5e8bd465f3d9ef3270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 5112 bytes
font_01_sfnt_off0000756b.bin
b483a97721a4f6b07eacafe788bf402c0d54014e270b2de4f107076265f189f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x756B 10864 bytes
font_02_sfnt_off00009a77.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A77 4324 bytes

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