Malicious PDF — malware analysis report

Static analysis result for SHA-256 11bb4fa2c4608422…

MALICIOUS

PDF

34.0 KB Created: 2020-08-11 05:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3028953816d6ac050982023b61b88ee2 SHA-1: a8ff4a13cb50f54cb2e7e2460b866e270dcc8f91 SHA-256: 11bb4fa2c460842273ed4ca327ff7e72602d06119bdc94edd64c8b2ff75df3a8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=creep+radiohead+piano+chords+pdf`. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to manipulate search engine results, further supporting a malicious intent to drive traffic to potentially harmful sites. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive 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=creep+radiohead+piano+chords+pdf
    • http://files.bruceconstruction.net/uploads/1/3/2/6/132681836/53d3978b16.pdf
    • http://files.egoligolf.com/uploads/1/3/1/4/131406269/xisurovox-lefalimo.pdf
    • http://dajiwewi.corpuschristievansville.org/uploads/1/3/1/6/131636725/zivumiterefirusomadi.pdf
    • http://files.harlanparkbaptist.com/uploads/1/3/2/6/132695478/2354188.pdf
    • https://www.amchords.com/chords/732034
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/2280/9250/files/libro_3msc_3.pdf
    • https://cdn.shopify.com/s/files/1/0435/3661/3544/files/lobib.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3077/files/childhood_asperger_syndrome_test.pdf
    • https://cdn.shopify.com/s/files/1/0437/2011/4331/files/zalijitisinazo.pdf
    • https://cdn.shopify.com/s/files/1/0449/7843/8302/files/daratagodasitoluxonobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8524/1256/files/togugenubujoritu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8891/1267/files/certyfikat_kompetencji_zawodowych_testy.pdf
    • https://cdn.shopify.com/s/files/1/0437/1962/2808/files/limurelikovizutagusuka.pdf
    • https://cdn.shopify.com/s/files/1/0436/5297/2697/files/xukaxozugeziw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/22506403024.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/54216965513.pdf
    • https://cdn.shopify.com/s/files/1/0431/2743/9526/files/lomiduzabi.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_off000048d0.bin
0e6b7e7a05558503c403d8d2eb8aca30fec9721b69bf2d4a095dc668928d922d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48D0 5116 bytes
font_01_sfnt_off00005a29.bin
428a9f22ba3b8b0a44929a55d3277399375fe5c0f052ced9df14932ba6a5bb82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A29 9584 bytes

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