Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed76b8883394cd4…

MALICIOUS

PDF

44.6 KB Created: 2020-08-07 22:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de422e00d4f47d6cf993bece32f82b57 SHA-1: 638aebc5f4cea1b157649b42d908ec329e86b914 SHA-256: aed76b8883394cd4ea7c08c4ad393825f96ed597211474829c37b2a5f77d97fd
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=astragalus+gombo+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on cdn.shopify.com. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and the primary malicious URL, suggesting a lure to a phishing or malware distribution site.

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=astragalus+gombo+pdf
    • http://files.daveghilarducci.com/uploads/1/3/0/9/130969192/vexidenijujiguto.pdf
    • http://files.region8so.org/uploads/1/3/1/4/131454586/f06245b.pdf
    • http://files.rotaractbeijingwest.org/uploads/1/3/1/0/131071249/38dba.pdf
    • https://cdn.shopify.com/s/files/1/0434/0056/0803/files/gumaxirazobiwatamag.pdf
    • https://cdn.shopify.com/s/files/1/0431/0846/6845/files/western_blot_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/historia_augusta.pdf
    • https://cdn.shopify.com/s/files/1/0431/5843/8056/files/79776804848.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/70968866909.pdf
    • https://cdn.shopify.com/s/files/1/0430/5852/8405/files/kuninafefamex.pdf
    • https://cdn.shopify.com/s/files/1/0433/9394/1671/files/bazujidus.pdf
    • https://cdn.shopify.com/s/files/1/0429/9423/7589/files/pixivogimiporisubafosiso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sezam.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/50653707251.pdf
    • https://cdn.shopify.com/s/files/1/0433/7595/2030/files/588540539.pdf
    • https://cdn.shopify.com/s/files/1/0436/2862/6080/files/43915611240.pdf
    • https://cdn.shopify.com/s/files/1/0429/2031/2991/files/79133393851.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_off000052a8.bin
b68668f57aa408deeecef36ee9d3583d20e7ccf344fb82ba7f7a4d405b2fc6f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52A8 5492 bytes
font_01_sfnt_off0000653a.bin
b339847c64eac4c31d85b71a29eef4fc0cb2c1d2611ad5957a2602030c0ce705		 pdf-font-stream PDF embedded font (sfnt) at offset 0x653A 12716 bytes
font_02_sfnt_off00008e95.bin
f04fb96856fa86c99babb5bf309615b780632e07d2318923ed038a7bfd4fd4ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E95 16204 bytes

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